What I tried to find on Rob Dickinson's website, but couldn't, was pictures from the "good old days" of just a few years ago when the engines would burn bagass (what is left of the cane stalks after the juice is squeezed out.) It is very light stuff, pressed into bales and stacked on the tender.
When they burned it at night, the result is a spectacular spark show, with sparks flying everywhere. Ditto for the now-gone lumber operations in the Phillipines, where they would throw the off-cuts from the mill into the firebox. They were "volcanos" themselves; something you would never see on a Colorado narrow guage railroad; maybe at a traction engine meet.
-James Hefner
Hebrews 10:20a